Tenax IMS65 intermediate-modulus carbon-fibre family

Tenax IMS65 is an intermediate-modulus carbon fibre from Teijin Carbon, supplied as continuous filament yarn for reinforcing composite structures. It is listed within the Tenax filament yarn range, in the family of intermediate-modulus grades that sit between standard-modulus high-strength fibres and high-modulus fibres.

The grade is supplied in several tow formats. The filament yarn overview lists IMS65 with an E23 sizing level in a 24K tow of 830 tex and a 36K tow of 1630 tex, and the 36K tow is also listed with an additional sizing variant. Tow size sets the fibre area per tow and so affects weave or tape design, areal weight and the handling of the yarn in winding, braiding or prepreg manufacture.

The properties in the overview support structural selection. For the 24K, 830 tex yarn, tensile strength is 6000 MPa, elongation at break is 2.1 %, and density is 1.78 g/cm3. The 36K, 1630 tex yarn is listed with a tensile strength of 5800 MPa, a tensile modulus of 280 GPa, an elongation at break of 2.1 % and a density of 1.80 g/cm3. The sizing of the listed IMS65 yarns is of the epoxy-compatible type (EP) at 1.3 % content. Strength combined with a stiffness higher than standard-modulus fibre makes this fibre suitable for parts where weight saving and stiffness both matter.

For processing, the sizing must match the matrix resin, so the exact material designation, with its tow size and sizing, should be confirmed with Teijin Carbon before a specification is written. The maker advises contacting its sales team to choose the right product, and values in the overview depend on its test methods.

Typical applications are composite airframe parts, wing and tail spars, fuselage shells, booms and arms for multirotors, and pressure vessels or rotating parts that need a high stiffness-to-weight ratio.